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Fencer Vulns
medium 5.0

CVE-2005-0255 json

String handling functions in Mozilla 1.7.3, Firefox 1.0, and Thunderbird before 1.0.2, such as the nsTSubstring_CharT::Replace function, do…

published 2005-02-28 21 y ago modified 2026-06-16 4 mo ago also EUVD-2005-0256

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

String handling functions in Mozilla 1.7.3, Firefox 1.0, and Thunderbird before 1.0.2, such as the nsTSubstring_CharT::Replace function, do not properly check the return values of other functions that resize the string, which allows remote attackers to cause a denial of service and possibly execute arbitrary code by forcing an out-of-memory state that causes a reallocation to fail and return a pointer to a fixed address, which leads to heap corruption.

Patch / fix

  • thunderbird RHEL 4 1.0.2-1.4.1
  • firefox RHEL 4 1.0.1-1.4.3

red hat advisories RHSA-2005:337RHSA-2005:176

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2005-0255 updated

security flaw

  • Red Hat Enterprise Linux AS version 4 firefox 1.0.1-1.4.3, thunderbird 1.0.2-1.4.1 Red Hat Enterprise Linux Desktop version 4 firefox 1.0.1-1.4.3, thunderbird 1.0.2-1.4.1 Red Hat Enterprise Linux ES version 4 firefox 1.0.1-1.4.3, thunderbird 1.0.2-1.4.1 Red Hat Enterprise Linux WS version 4 firefox 1.0.1-1.4.3, thunderbird 1.0.2-1.4.1
    fixed: vendor fix RHSA-2005:176

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.29% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.